src/plugins/ctf/lttng-live/data-stream.c

   1 /*
   2  * Copyright 2019 Francis Deslauriers <francis.deslauriers@efficios.com>
   3  * Copyright 2016 - Philippe Proulx <pproulx@efficios.com>
   4  * Copyright 2016 - Jérémie Galarneau <jeremie.galarneau@efficios.com>
   5  * Copyright 2010-2011 - EfficiOS Inc. and Linux Foundation
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a copy
   8  * of this software and associated documentation files (the "Software"), to deal
   9  * in the Software without restriction, including without limitation the rights
  10  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  11  * copies of the Software, and to permit persons to whom the Software is
  12  * furnished to do so, subject to the following conditions:
  13  *
  14  * The above copyright notice and this permission notice shall be included in
  15  * all copies or substantial portions of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  18  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  20  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  21  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  22  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  23  * SOFTWARE.
  24  */
  25
  26 #define BT_COMP_LOG_SELF_COMP self_comp
  27 #define BT_LOG_OUTPUT_LEVEL log_level
  28 #define BT_LOG_TAG "PLUGIN/SRC.CTF.LTTNG-LIVE/DS"
  29 #include "logging/comp-logging.h"
  30
  31 #include <inttypes.h>
  32 #include <stdio.h>
  33 #include <stdlib.h>
  34
  35 #include <glib.h>
  36
  37 #include <babeltrace2/babeltrace.h>
  38
  39 #include "../common/msg-iter/msg-iter.h"
  40 #include "common/assert.h"
  41 #include "compat/mman.h"
  42 #include "data-stream.h"
  43
  44 #define STREAM_NAME_PREFIX      "stream-"
  45
  46 static
  47 enum ctf_msg_iter_medium_status medop_request_bytes(
  48                 size_t request_sz, uint8_t **buffer_addr,
  49                 size_t *buffer_sz, void *data)
  50 {
  51         enum ctf_msg_iter_medium_status status =
  52                 CTF_MSG_ITER_MEDIUM_STATUS_OK;
  53         struct lttng_live_stream_iterator *stream = data;
  54         struct lttng_live_trace *trace = stream->trace;
  55         struct lttng_live_session *session = trace->session;
  56         struct lttng_live_msg_iter *live_msg_iter = session->lttng_live_msg_iter;
  57         uint64_t recv_len = 0;
  58         uint64_t len_left;
  59         uint64_t read_len;
  60
  61         BT_ASSERT(request_sz);
  62
  63         if (stream->has_stream_hung_up) {
  64                 status = CTF_MSG_ITER_MEDIUM_STATUS_EOF;
  65                 goto end;
  66         }
  67
  68         len_left = stream->base_offset + stream->len - stream->offset;
  69         if (!len_left) {
  70                 stream->state = LTTNG_LIVE_STREAM_ACTIVE_NO_DATA;
  71                 status = CTF_MSG_ITER_MEDIUM_STATUS_AGAIN;
  72                 goto end;
  73         }
  74
  75         read_len = MIN(request_sz, stream->buflen);
  76         read_len = MIN(read_len, len_left);
  77         status = lttng_live_get_stream_bytes(live_msg_iter,
  78                         stream, stream->buf, stream->offset,
  79                         read_len, &recv_len);
  80         *buffer_addr = stream->buf;
  81         *buffer_sz = recv_len;
  82         stream->offset += recv_len;
  83 end:
  84         return status;
  85 }
  86
  87 static
  88 bt_stream *medop_borrow_stream(bt_stream_class *stream_class,
  89                 int64_t stream_id, void *data)
  90 {
  91         struct lttng_live_stream_iterator *lttng_live_stream = data;
  92         bt_logging_level log_level = lttng_live_stream->log_level;
  93         bt_self_component *self_comp = lttng_live_stream->self_comp;
  94
  95         if (!lttng_live_stream->stream) {
  96                 uint64_t stream_class_id = bt_stream_class_get_id(stream_class);
  97
  98                 BT_COMP_LOGI("Creating stream %s (ID: %" PRIu64 ") out of stream "
  99                         "class %" PRId64, lttng_live_stream->name->str,
 100                         stream_id, stream_class_id);
 101
 102                 if (stream_id < 0) {
 103                         /*
 104                          * No stream instance ID in the stream. It's possible
 105                          * to encounter this situation with older version of
 106                          * LTTng. In these cases, use the viewer_stream_id that
 107                          * is unique for a live viewer session.
 108                          */
 109                         lttng_live_stream->stream = bt_stream_create_with_id(
 110                                 stream_class, lttng_live_stream->trace->trace,
 111                                 lttng_live_stream->viewer_stream_id);
 112                 } else {
 113                         lttng_live_stream->stream = bt_stream_create_with_id(
 114                                 stream_class, lttng_live_stream->trace->trace,
 115                                 (uint64_t) stream_id);
 116                 }
 117
 118                 if (!lttng_live_stream->stream) {
 119                         BT_COMP_LOGE_APPEND_CAUSE(self_comp,
 120                                 "Cannot create stream %s (stream class ID "
 121                                 "%" PRId64 ", stream ID %" PRIu64 ")",
 122                                 lttng_live_stream->name->str,
 123                                 stream_class_id, stream_id);
 124                         goto end;
 125                 }
 126
 127                 bt_stream_set_name(lttng_live_stream->stream,
 128                         lttng_live_stream->name->str);
 129         }
 130
 131 end:
 132         return lttng_live_stream->stream;
 133 }
 134
 135 static struct ctf_msg_iter_medium_ops medops = {
 136         .request_bytes = medop_request_bytes,
 137         .seek = NULL,
 138         .borrow_stream = medop_borrow_stream,
 139 };
 140
 141 BT_HIDDEN
 142 enum lttng_live_iterator_status lttng_live_lazy_msg_init(
 143                 struct lttng_live_session *session,
 144                 bt_self_message_iterator *self_msg_iter)
 145 {
 146         struct lttng_live_component *lttng_live =
 147                 session->lttng_live_msg_iter->lttng_live_comp;
 148         uint64_t trace_idx, stream_iter_idx;
 149         bt_logging_level log_level = session->log_level;
 150         bt_self_component *self_comp = session->self_comp;
 151
 152         if (!session->lazy_stream_msg_init) {
 153                 return LTTNG_LIVE_ITERATOR_STATUS_OK;
 154         }
 155
 156         BT_COMP_LOGD("Lazily initializing self message iterator for live session: "
 157                 "session-id=%"PRIu64", self-msg-iter-addr=%p", session->id,
 158                 self_msg_iter);
 159
 160         for (trace_idx = 0; trace_idx < session->traces->len; trace_idx++) {
 161                 struct lttng_live_trace *trace =
 162                         g_ptr_array_index(session->traces, trace_idx);
 163
 164                 for (stream_iter_idx = 0;
 165                                 stream_iter_idx < trace->stream_iterators->len;
 166                                 stream_iter_idx++) {
 167                         struct ctf_trace_class *ctf_tc;
 168                         struct lttng_live_stream_iterator *stream_iter =
 169                                 g_ptr_array_index(trace->stream_iterators,
 170                                         stream_iter_idx);
 171
 172                         if (stream_iter->msg_iter) {
 173                                 continue;
 174                         }
 175                         ctf_tc = ctf_metadata_decoder_borrow_ctf_trace_class(
 176                                 trace->metadata->decoder);
 177                         BT_COMP_LOGD("Creating CTF message iterator: "
 178                                 "session-id=%"PRIu64", ctf-tc-addr=%p, "
 179                                 "stream-iter-name=%s, self-msg-iter-addr=%p",
 180                                 session->id, ctf_tc, stream_iter->name->str, self_msg_iter);
 181                         stream_iter->msg_iter = ctf_msg_iter_create(ctf_tc,
 182                                 lttng_live->max_query_size, medops, stream_iter,
 183                                 log_level, self_comp, self_msg_iter);
 184                         if (!stream_iter->msg_iter) {
 185                                 BT_COMP_LOGE_APPEND_CAUSE(self_comp,
 186                                         "Failed to create CTF message iterator");
 187                                 goto error;
 188                         }
 189                 }
 190         }
 191
 192         session->lazy_stream_msg_init = false;
 193
 194         return LTTNG_LIVE_ITERATOR_STATUS_OK;
 195
 196 error:
 197         return LTTNG_LIVE_ITERATOR_STATUS_ERROR;
 198 }
 199
 200 BT_HIDDEN
 201 struct lttng_live_stream_iterator *lttng_live_stream_iterator_create(
 202                 struct lttng_live_session *session,
 203                 uint64_t ctf_trace_id,
 204                 uint64_t stream_id,
 205                 bt_self_message_iterator *self_msg_iter)
 206 {
 207         struct lttng_live_stream_iterator *stream_iter;
 208         struct lttng_live_component *lttng_live;
 209         struct lttng_live_trace *trace;
 210         bt_logging_level log_level;
 211         bt_self_component *self_comp;
 212
 213         BT_ASSERT(session);
 214         BT_ASSERT(session->lttng_live_msg_iter);
 215         BT_ASSERT(session->lttng_live_msg_iter->lttng_live_comp);
 216         log_level = session->log_level;
 217         self_comp = session->self_comp;
 218
 219         lttng_live = session->lttng_live_msg_iter->lttng_live_comp;
 220
 221         stream_iter = g_new0(struct lttng_live_stream_iterator, 1);
 222         if (!stream_iter) {
 223                 BT_COMP_LOGE_APPEND_CAUSE(self_comp,
 224                         "Failed to allocate struct lttng_live_stream_iterator");
 225                 goto error;
 226         }
 227
 228         stream_iter->log_level = log_level;
 229         stream_iter->self_comp = self_comp;
 230         trace = lttng_live_session_borrow_or_create_trace_by_id(session, ctf_trace_id);
 231         if (!trace) {
 232                 BT_COMP_LOGE_APPEND_CAUSE(self_comp,
 233                         "Failed to borrow CTF trace.");
 234                 goto error;
 235         }
 236
 237         stream_iter->trace = trace;
 238         stream_iter->state = LTTNG_LIVE_STREAM_ACTIVE_NO_DATA;
 239         stream_iter->viewer_stream_id = stream_id;
 240         stream_iter->ctf_stream_class_id = -1ULL;
 241         stream_iter->last_inactivity_ts = INT64_MIN;
 242
 243         if (trace->trace) {
 244                 struct ctf_trace_class *ctf_tc =
 245                         ctf_metadata_decoder_borrow_ctf_trace_class(
 246                                 trace->metadata->decoder);
 247                 BT_ASSERT(!stream_iter->msg_iter);
 248                 stream_iter->msg_iter = ctf_msg_iter_create(ctf_tc,
 249                         lttng_live->max_query_size, medops, stream_iter,
 250                         log_level, self_comp, self_msg_iter);
 251                 if (!stream_iter->msg_iter) {
 252                         BT_COMP_LOGE_APPEND_CAUSE(self_comp,
 253                                 "Failed to create CTF message iterator");
 254                         goto error;
 255                 }
 256         }
 257         stream_iter->buf = g_new0(uint8_t, lttng_live->max_query_size);
 258         if (!stream_iter->buf) {
 259                 BT_COMP_LOGE_APPEND_CAUSE(self_comp,
 260                         "Failed to allocate live stream iterator buffer");
 261                 goto error;
 262         }
 263
 264         stream_iter->buflen = lttng_live->max_query_size;
 265         stream_iter->name = g_string_new(NULL);
 266         if (!stream_iter->name) {
 267                 BT_COMP_LOGE_APPEND_CAUSE(self_comp,
 268                         "Failed to allocate live stream iterator name buffer");
 269                 goto error;
 270         }
 271
 272         g_string_printf(stream_iter->name, STREAM_NAME_PREFIX "%" PRIu64,
 273                 stream_iter->viewer_stream_id);
 274         g_ptr_array_add(trace->stream_iterators, stream_iter);
 275
 276         /* Track the number of active stream iterator. */
 277         session->lttng_live_msg_iter->active_stream_iter++;
 278
 279         goto end;
 280 error:
 281         lttng_live_stream_iterator_destroy(stream_iter);
 282         stream_iter = NULL;
 283 end:
 284         return stream_iter;
 285 }
 286
 287 BT_HIDDEN
 288 void lttng_live_stream_iterator_destroy(
 289                 struct lttng_live_stream_iterator *stream_iter)
 290 {
 291         if (!stream_iter) {
 292                 return;
 293         }
 294
 295         if (stream_iter->stream) {
 296                 BT_STREAM_PUT_REF_AND_RESET(stream_iter->stream);
 297         }
 298
 299         if (stream_iter->msg_iter) {
 300                 ctf_msg_iter_destroy(stream_iter->msg_iter);
 301         }
 302         g_free(stream_iter->buf);
 303         if (stream_iter->name) {
 304                 g_string_free(stream_iter->name, TRUE);
 305         }
 306
 307         bt_message_put_ref(stream_iter->current_msg);
 308
 309         /* Track the number of active stream iterator. */
 310         stream_iter->trace->session->lttng_live_msg_iter->active_stream_iter--;
 311
 312         g_free(stream_iter);
 313 }